Cause
Defects
in
fuel tank
system
Defects in carburetor
Defects in carburetor
Excess load
Piston or Connecting
Rod
seized
Remedy
1)
Clean clogged tank outlet.
2)
Clean clogged fuel strainer.
3)
If incorrect fuel is poured into tank or
water is mixed, drain tank completely and
fill
it
with correct fuel.
4)
When fuel pipe is locked with air, expel1 air.
1
)
If clogged with
dust,
clean.
2)
If defective, replace.
Clean jets and other orifices,
if
they are
clogged.
1)
Start engine with fully open choke vatve and
half open throttle valve.
2)
Remove drain plug from crankcase, and
close fuel cock, repeat starting operation
several times to evacuate excess fuel.
If
fuel overflows, check needle valve seat for
wear. Replace, if necessary.
1)
If power transmission
belt
is
too tight,
2)
If
load
is
still too heavy, install a clutch.
correct tension.
1)
If piston seizes, correct or replace.
2)
If
connecting rod large end
or
small end
seize, replace.
Preventive measure
11
Be sure to use
a
filter when adding fuel.
2)
Use
mixture (gasoline
25
:
oil
1
)
as fuel.
1)
Never
close
choke valve when engine
is
2)
When stopping the engine, run it at
slow
speed for a while. This practice not only
favourably affects next starting, but
also
improves engine life.
3)
Clogged air-cleaner results in
too
rich air-
fuel mixture.
C\ean
it
throughly.
warm.
Be careful clogged carburetor.
1
)
Do not use poor grade oil.
2)
Use
fuel
of
proper mixing ratio.
11-2
SLOW-SPEED
out of
order
1)
If
the pilot screw in the carburetor is not correctly adjusted, correct it. Refer to section
"9-3.
ADJUSTMENTS
of CARBURETOR".
2)
Most defects listed as causes
for
starting difficulty are also causes for faulty slow-speed operating.
11-3
OVERHEATING
and
KNOCKING
1)
If the ignition timing is
too
far advanced, correct it.
Model EC05-2,07-2,25-2
.....
23"
Model EClO
...............
18"
Model EC17
..............
.22"
2) If
too
much carbon deposits in the combustion chamber,
remove
it.
3)
if
the heat
range
of
the spark plug is
too
cool, replace
it
with correct one.
Model EC05-2,07-2,25-2
.....
NGK
B6HS
Model EClO
...............
NGK
B-4
Model EC17
...............
NGK
B-4H
4)
If the air-fuel mixture is too lean, clean jets and other holes in .the carburetor.
Clean the aircleaner also.
5)
If the load is in excess, reduce it below the specified continuous load.
p
\.
'
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44
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